ᐅ Y-Tong Garage Built Directly on Forming Blocks – Is That a Good Idea?

Hello friends,

Our garage builder surprised us today. Until now, I was familiar with the following sequence: strip footing, formwork blocks filled with concrete, concrete slab, then masonry.

However, he proposes strip footing, filling formwork blocks with concrete, applying a damp-proof membrane, and then building with Ytong blocks on top. The floor slab is to be poured with fiber cement concrete, 20 cm (8 inches) thick, including edge insulation strips, up to the height of the formwork blocks. I don’t quite understand this approach. The soil has been excavated and compacted with lime gravel, 50 cm (20 inches) thick.

The 6 x 9 m (20 x 30 ft) garage will have a timber flat roof. Could you help me? Is this a recognized method? Both the building inspector and the surveyor mentioned that structural calculations are usually not necessary for a garage if it is adequately dimensioned from the start. I can agree with that, but is this the right way?

I think this works fine in practice. We have a prefabricated garage measuring six by 3 meters (approximately 20 by 10 feet), which was simply placed on backfilled concrete blocks. It works. It holds, no problem.